Controller for electric drills.



W. O. DUNTLEY & H. J. KIMMAN. Y

CONTROLLER FOR ELECTRIC DRILLS. APPLICATION FILED JAN.22, 1906.

' 904,851. Patented Nov. 24, 1908. I 2 SHEETS-$11531 1.

' /\V ummunpg; L yum W. 0. DUNTLEY & H. JLKIMMAN.

CONTROLLER FOR ELECTRIC DRILLS.

APPLICATION FILED JAN.22,1906.

Patented Nov. 24,1908.

2 SHEETS-SHEET 2.

I WILLIAM O, DUN 'lLEY, OF CHICAGO, ILLINOIS ASSIGNORS TO CHICAGO PNEUMATIC TOO .To all whom 'it concern:

(lON TBOLLER FOR ELECTRIC DRILLS Specification of Letters iatent.

PATENT OFFICE.

,AND HENRY J. KIMMAN, OF CLEVELAND, 01110, L COMPANY, oFoHIoAeo, ILLINOIS, A ooaro- Patented Nov. 24, 1,908.

' Application filed January 22, 1906. Serial Njo. 297,378.

Be it knownthat we, WILLIAM O. DUNT- lEY, residingat Chigago, Cook county, Illinois, and HENRY Cleveland, Cuyahoga county, Ohio, citizens of the-United States, have invented certain new and useiul Improvements in Controllers is a specification.

for Electric Drills, of which the following Our invention relates to electric drills in which the drill or other-working tool is rofated b an electric motor or motors througha the me 'um of'proper'operating connections,

and relates more particularly to the switch for c'Ontrolling the supply of'current to the motor ormotors.

The object of our invention is to provide 'a reversing switch i'n connection-with the main or controlling switch and tocausesuch switches to so coiiperate that the reversing switch is enabled to'be operated onlywhen the main or controllin switch is in off position, with the resu t that the motor cannot be reversed while running in the -opposite direction, and the possib lity of biu'ning out the motor and the destruction of the fuses caused by an excessive flow of current overcome.

In the drawings, Fi re 1 is a side elevation of an electric dri in which our invention has been embodied; Fig. 2 'a sideele-' vation' of a portion of the 'drillwith a part thereof broken away to expose the interior of the switch box or casin F ig. 3 a lan view of the same side of the drlll as i lustrated in Fig. 2 and illustrating the switch device thereof; Fig. 4 an elevation of the inner faceof the switch device detaChed and illustrati the reversing switch; Fig.5 a sectional efie moved and taken on the line 5 5 of Fig. 6; Fig. 6 a sectional-elevation on the line of Fig. 3; and Fig. 7 a bottom lan view of the switch device and associated parts.

Inasmuch as our invention relates only to the switch devices of an electric drill, such drill need'be described and illustrated 0111 in ageneralway and it will therefore su ce'tosay-that the drill is provided with a main casing 1, to which the switch devi' including the main or controlling switch an the reversing switch "is attached. In the present instance, as i lustrated in Figs. 1, 2 a

J. KIMMAN, residing at.

vation of the switch device reand 3, the switch device is contatined within a supplemental casing or box formed by the late 2 at one side of the casing and at the Ease of one of the graspinghandles 3 of the drill.

Referring first to the switch which controls the supply leads to the motor, which switch, for convenience, will be hereinafter termed the main switch, as distinguished from the 'reversin'gswitch, such main switch is arran ed and mounted within a frame 4 provided with a transverse rock-shaft'5, on which is mounted to oscillate a pair of rocker arms or levers 6, having two arms extending1 diametricallyin opposite directions and a ependi'n'g arm 6 at ri 'ht angles to the other or similar arms. fihe two sets of opposite arms are operatively connected connection, in the present instance, being in the nature of a pin and slot connection, the pins 9 and 10 projecting from the lower ends of the switch buttons 7 and 8, respectively, and the slots being in-the sets of the similar arms of the rocker arms or lovers 6. Loosel hung upon the rock shaft 5 is the knife lade 11 having a yielding operating connection through the-medium of the s ring 12 and the fork 13 connected with the ife blade and cooperating with ,the transverse in '14 arranged betweenthe-said arms 6.

his knife blade 11 constitutes the movable member or contact which-coo crates with the stationary contacts 15 whic are mounted upon a plate-16 of fiber or other suitable insulating material.

When the parts are in the relative position illustrated in Fi'. 5. with the switch button 7 elevated and t e button 8depressed, the switch is in'ofi position, inasmuch as the knife "blade 1i lfsbfit ofcontact with the stationary contacts 15. When, however, the button 7 is depressed and the rocker'arms or levers 6 are thereby-oscillated in an anticlockwise direction (.Fi .5) the knife blade or movable contact is t own suddenly into contacting position withrespect to said stati'onary stnntiall reached orpassedjthe'cefitral iongitudina line "of the knife blade and. the

by which it is :SIIS" ended. The conl remgiain thisigcn position until LL03 with the lower ends of thetwo switch but tons or plungers 7 and 8, such operative v sition and the circuit which supplies the button 8, which has been'elevated by the depression of the button 7, is itself depressed, to brin aboutthe relative position of the parts illustrated in Fig. 5, whereuponfthe switch is thrown suddenly into its ofi' porent to the motor is broken.

v consistsof a knurled The reversing switch comprises a disk 17 mounted upon the inner end of the rock shaft 5 and arranged to rock with said shaft. This disk projects through a circular opening cut in the fiber-plate or block '16 and is provided with contacts which are in the form of segments 18 and 19 arranged on 0ppositesides of the center of the disk. These segments constitute the movable members or contacts 20, 21.and;22-'caa provided with.

similar binding posts 2 6,97 and 28, res ctively, similar tot-he binding post 25. The two binding posts 27 and 28 are connected tothe leading in wires, ing posts 25 and 26 are connected with the swltch elements, it being understood that in use the bindin post 24 is electricallyconnected with 51c binding post 26'. The proper running of the circuits in which the motor is included is so obvious to those skilled in the art that no further explanation ls'required, p

It will be understood that the switch device is arranged ad acentthe inner end or handles of the post of one of the aspin drill, as clearly indicated in the drawings, particularly in Fig. 6, wherein the plate or silllpplemental casing 2 which projects latera y from themain casing of the drill is provided with a lateral cylindrical boss"29 with in which the articular as i .handle. 3 just referred is secur e dfa s by screwthreading thereto; For operating the reversing switch we provide novel and .efiicient mechanism which, in the present instance, or corrugated sleeve 30, whines inner diameter substantially equals th outer diameter of the boss 29'an'd is arranged to be oscillated thereon, such sleeve being also, in the present instance, concentric with said gras mg handle 3. As more" clearly' indicate in Fig. 6, the rock shaft 5 1s provided at its outerend with an arm 31 which projects upwardly through an arc- 3 m y b oscill ed while the two bindshapedgsldtf32 inthe-boss 29 and into a slot 33 n the sleeve 30. It will be evident that upon oscillating the sleeve in one direction or the other the shaft 5 is rocked so as to cause a reversal of the direction of rotation of the motor by changing the relative positionoi thesegments 18 and 19 with respect to their stationary contacts.

For the purpose of locking the reversing switch 'tions, we provide novel and effic1ent-mechanin one or the other ofits two posiism and" which consists, in the present instance, of a notched flange3t forming a part' of the sleeve 30 and arranged to' cooperate with a movable member or element of the main -switch. As shown 36 which are substantially sleeve The'movable element of the main switch which cooperates with. these notches more clearly m Fig. 1, the flange 34 is provided with two notches 35 and I transverse to the direction of rotation of the and which constitutes the locking mechanism in-connection therewith, consists of; a pin 37 extendinglaterally from the button 7 oi the mainswltch, as clearly indicated in'Figs'.'"1,' 2,3 and 5. "Theconstructionandaarra switch isIat-"F 0a?- clear {of the notches Fig. 1. Consequent position, the in 37 is .at-this time t1.- sleeve mg switrlilf .when, however, the zbutton7 is ment is such that when the button flis'in its flsgatbd "position that. is whenthe main;

or operating the rovers-H depressed and gtheimain switch thereupon mat .on ositio'n the 'in137-. is likewise epressed, by which movement such pin is pro ected into'one of the other slots 35 or 36 which case the reversing sw tch is in'the position. indicated in Fig. 1, the pin 37 will-be projected into the notch 35. n'whichever notch the condition continues so 10 switch is at on position.

the main switch is operated to off tion, thereby carryingthe pin 37 to'an in operative position, the locking mechanism is as .the main rendered inpperativewhereup'on the reversing switch is free to be operated. By these happensto be presented thereto. In.

pm .37 may be projected, the" reversingf switch is locked against operation and this en, however,

pos1- means and in this manner, the-motor is pro- .tected against roper manipulation by an unskille or care ess workman, inasmuch as it is practically impossible-tpiburn out the motor or destroy the fuses in the'operati on of reversmg'the motor, which might easily occur in case the levels ogeration of ,.the',two types o't switches t.

switch wasopers ated while the-main witc was still at on position. i The described association and co' ough the medium of the locking mechanism, absolutely prevents the operation of the reversin switch is at on position with the. result that the operator'in compelled to first turn switch whenever the main off the main switch and break the su ply of current' to the motor'before he is ena led to operate the reversing switch. .Moreover, the flange 34 serves another function besides that of acting as part of the locking mechanism, inasmuch as the outer portion of the longer sides or walls of the notches constit-ute, iii-connection with the pin 37 stops for limiting 'the degree of oscillation of the sleeve and consequently of the reversing switch in one direction or the other.

. Weclaim:

1. In combination with an electric drill,

' and its grasping handles, a main switch' arranged adjacent one ofsuch handles, 'a reversing switch, and means for locking the reversing switch when the main switch is at on 1 position.

2. -In combination with an electric drill and its' grasping handles, a main switch arranged adjacent the inner end of one of the handles, a reversing switch, and means for locking the reversing switch when the main switch is at on. position. V

-3. In combination with an electric drill and its grasping handles, a main switch arranged adjacent the inner end of one of th handles and having operating buttons ,0

either side of the longitudinal axis of said,

handle, "a reversing switch, andmeans for locking the-reversing switch when'the main.

switch is at en positirm;

4. In combination with an electric drill,

and .its grasping handles,-a main switch ar-' ranged adjacent one 6f such handles, areversing switch,.and a sleeve concentric'with said handle for operating the reversing switch.

5. Incombination with an electric drill, and its grasping handles, a main switch arranged adjacent one of such handles, a reversmg switch, buttons adjacentthe base of said handle for 'operatingthe main switch,

and a sleeve -for operatingv switch.

-6. In combination with electric drill the reversing and its grasping handles, a .main switch, a

, reversing switch when the former is "con'iprismg a notched flange on the reversing switch, a sleeve concentric with one .8. In combination with an electric drilland its grasping handles, a main switch, a reversing switch, a sleev concentric with one of the handles for operatin the reversing switch, and means controlle by the operation of the main switch for locking reversing switch when the former is on,

comprising a flange having a pair of notches they corresponding with the two positions of the,

reversing switch, and a v actuated byithe main switch and positioned in one or the'other of said notches when the main switch is on but positioned outside thereof when the main switch-is ofi.

9; :Inv combination with an electric drill and its grasping handles, a main switch, a reversing switch, a sleeve concentric with one-of the handles for op'eratin the reversing switch, and'rneans controlle by the operation ofthe 'main switch for lockin the -reversing switch when the formeris on,

ovable projection comprising a flange having a pair of notches corresponding with the two positions of the reversing switch, said main switch having operating buttons, and a pin extending from one of the buttonsand arranged to be clear of the notches when the main switch is off but to be projected'into one of them to lock is f on.

10.1. In combination with an electric drill audits grasping 'handles, a main switch, a i'eversing'swltch, a sleeve concentric with one of the handles for operating the reversing switch, and means-controlled by the operationof. the main switch-for locking the rethe reversing-switch when the main switch Versing' switch when the' former is on,-

comprism a flange having a pair of notches substantia ly transverse to the direction of rotation of said sleeve and corresponding with the two portions of the reversing switch, said main switch havingoperatin'g buttons, and a-pin extending from one of the buttons and arranged to be projected into the pres entgd notch whenever the main switch is OIL v l v 11. In combination-with an 'electricdrill, and its grasping handles, a main-switch arranged adjacent one of such handles, a reversing switch, and a sleeve concentric with one of the grasping handles for operating the reversing switch.

12. In combinat' ionwith the casing of an electric drill and its grasping handles, .a switch box located at one side of said casing and having a boss with which one of the grasping handles is connected, a main switch and a reversing switch within said box, and

a sleeve mounted for oscillation on said boss.

and. operatively connected with the'reversing switch.

13. In c'timbination with the casing of an electric-drill and its grasping handles, a switch box located atone si e of said casing and having iibosswith which one of the its grasping handles is connected, a main switch and a reversing switch within said box, buttons arranged adjacent the base of outer end of said and having1 grasping handle, and a sleeve mounted for oscillation on said boss and operatively connected with the reversing switch.

14. In combination .with the casing of an electric drill and its grasping. handles, a switch box located at one side of said casing and having a boss with which one :of the grasping handles is connected, 2. main-switch and a reversing switch within said box, an

operating arm connected with the reversir switch and extending through said boss, an a sleeve mounted for oscillation on the boss and arranged to engage said operating arm.

, 15. In combination with the casing of an and reversing switch a'riangedwithin said boxand ineasy reach of the o rators hand grasping said particular handil '17. In combmation with ;an.electric drill, and its grasping handles, a main switch arranged adjacent one of such handles, a' reversing switch, means for lockin the reersing switch'when the main switch is at operating the reversing switch, and means for limiting the degree of oscillation of such member.

18. In combination with an electric drill,

and its grasping handles, a main switch ar- .ranged adjacent one of suchhandles, a reversing switch, and a combined lock and stop for locking the reversing switch when the main switch is at on position.

19; In combination with an electric drill, and its grasping handles, a main switch arranged adjacent one of such handles, and a combined lock and stop for locking the re-' versing switch when the main switch is-at on position, comprising a sleeve operatively connected with the reversing switch and provided with a flange having a reduced portion with end notches, and a pm actuated by its main switch and. cotiperatmgwith the reduced portion and notches of said flan e.

20.. In combination with an electric drill,

and its grasping handles, a main switch arranged adjacent one of such handles, a reversing switch, and a combined lock-and stop for locking the reversing switch when handles,

and to which one of the grasping handles is connected, and a combined main .secured to one side on position, an oscillating member for ating the main switch, an

'and operatively connecte the main switch is at on position, said main switch having operatin buttons, and a pin arranged on one of the uttons and cooperating with the reduced portion and notches of said flange.

. 21. In combination with an electric drill having diametrically positioned grasping a main switch, a rotatable reversing switch, saidswitches being arranged adjacent the inner end of one handles,- means' for locking the reversing switch against movement when the main switch is at on position. b

22. In combination with an electric drill having diametrically positioned grasping handles, a 'main' switch, a reversing switch, said switches being arranged adjacentthe of the grasping inner end of one of the grasping handles,

and a hand operated lockmg device for preventing operation of the reversing switch" when the main switch is at' on .position.

23. In combination with an electric drill having a main casing, a supplemental casing secured to one side of the-main casing, a

main switch and a reversing switch arranged within-the supplemental casing,'a grasping handle supported at its inner end in Said supplemental casing,

the main swltch is at on position;

24. In combination with an electric drill having a main casing, a supplemental casing of the main casing, a main switch and areversing switch arranged within the supplemental casing, agraspmg handle supported at its inner end in said supplemental casing, and a hand-o erated locking device located at the inner en of the handle for locking the reversing switch against movement when the main switch is at on position.

25. In combination with an electric drill having a main casing, a supplemental casing secured to one side of the main casing, a main switch and a reversing switch arranged within the supplemental casing, a

grasping handle supported at its inner end in said supplemental casin means for oper- 'a sleeve mounted for oscillation on the sucpplemental casing mg Switch' mam o DUNTLEY HENRY J. KIMMAN.

Witnesses to signature of William O.

Duntle g E. HmBnN, LOUIS B. ERWIN.

Witnesses to signature of Henry J .,Kimman:

F. D. JoHNsoN,

C. E. WALKER.

with the revers- 

